Menace from the Deep achievements

Collect the "Accumulator" collection

Collect the "Eye of Providence Amulet" collection

Fuse a Super-Sphere in campaign mode

Upgrade all buildings to maximum level in campagn mode

Complete 3 acts as the Professor in "Custom Game" mode on at least medium difficulty with a normal number of enemies.

Complete 3 acts on high difficulty with an increased number of enemies in "Custom Game" mode.

Collect the "Tourist Backpack" collection

Level up The Monolith to level 25

Complete the campaign mode story

Collect the "Phrenology Bust" collection

Defeat the Cthulhu boss fight

Collect the "Turban" collection